California Rapid Assessment Method for Wetlands - State Water ...

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California Rapid Assessment Method for Wetlands v. 5.0.2 – Chapter 4 B. Rationale: A wider buffer has a greater capacity to serve as habitat for wetland edgedependent species, to reduce the inputs of non-point source contaminants, to control erosion, and to generally protect the wetland from human activities. Also see the buffer rationale presented in Section 4.1.2 above. C. Seasonality: This metric is not sensitive to seasonality. D. Office and Field Indicators: This procedure can be performed initially in the office using the site imagery, and then revised based on the field visit. The procedure has four steps as presented in Table 4.6 below. There are special considerations for riverine wetlands explained below in Figure 4.4. Table 4.6: Steps to estimate Buffer Width for all wetlands except Riverine, for which these steps are modified according to Figure 4.4. Step 1 Step 2 Step 3 Step 4 Identify areas in which open water is within 5 m of the AA. These areas are excluded from buffer calculations. Draw straight lines 250 m in length perpendicular to the AA through the buffer area at regular intervals along the portion of the perimeter of the AA that has a buffer. For one-sided riverine AAs, draw four lines; for all other wetland types, draw eight lines (see Figures 4.3 and 4.4 below). Estimate the buffer width of each of the lines as they extend away from the AA. Record these lengths on the worksheet below. Estimate the average buffer width and record it on the worksheet below. Upland Buffer Development Open Water Assessment Area Highway or Parking Lot Other Wetland A H A B B A B G C G H F E C D F E D Figure 4.3: Examples of method used to estimate Buffer Width. It is based on the lengths of eight lines A-H that extend at regular intervals though the buffer areas, whether they are not extensive (A) or all encompassing (B). 50
California Rapid Assessment Method for Wetlands v. 5.0.2 – Chapter 4 Worksheet 4.3: Calculating Average Buffer Width of AA Line A B C D E F G H Average Buffer Width Buffer Width (m) Riverine wetlands: For Riverine wetlands, conduct the steps of Table 4.6 with the following modifications. If the AA includes both sides of the channel (i.e., if the channel is wadeable), then draw four lines through the buffer areas on each side (see Figure 4.4 below). If the AA only exists on one side of the channel, then draw four lines through the buffer on one side (Figure 4.4). No lines should extend from the downstream or upstream ends of the riverine AA. Use worksheet 4.3 to record the data for buffer width. A B e a f b g c h d a b c d Figure 4.4: Diagram of approach to estimate Buffer Width for Riverine AAs. Widths are measured along lines a-h on both sides of a wadeable channel (A), and along lines a-d on one side of a non-wadeable channel (B). 51
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